>> Texas Instruments X-Loader 1.4.4ss (Nov 15 2010 - 08:42:50)
>> Unknown chip: mfr was 0x24, id was 0x01
>> Unsupported Chip!
>> X-Loader hangs
Cannot tell you what changed. I've detailed how to track the error below, but it looks like the NAND has been corrupted. It might be worth attempting to add a new mfr + id pair (matching the new values) to see what happens.
The error is generated after the function call to nand_chip() returns non-zero in x-loader source file /board/overo/overo.c
The overo seems to use the Samsung K9F1G08R0A driver. There are comments in the code that indicate this driver is useful for various Micron, Numonyx, and Hynix chips.
The driver file is found in x-load source /drivers/k9f1g08r0a.c